錬 - tempering, refine, drill

alchemy

tempering (metal); annealing; forging

alchemist

refinery; smelting works

veteran; battle-worn; schooled by adversity in many battles; hard-bitten; rich in experience; very experienced

wrought steel

to temper (steel)

training; drilling; strengthening

fire refining

refining; refinement; smelting

flash smelting; autogenous smelting

well-tempered; well drilled; well trained